JP2020069436A - Electric dust collector - Google Patents

Abstract

To provide an electric dust collector improving gas sealing performance between a dust collection electrode chamber and an insulator chamber.SOLUTION: An electric dust collector 10 has a first ring-shaped elastic seal member that is wound around a suspension rod 2, and installed while being sandwiched between an inner peripheral surface of a suspension rod insertion through-hole 121 formed at a center of an upper surface portion of a through insulator 1 and an outer peripheral surface of the suspension rod 2; and a second ring-shaped elastic seal member that is wound around the suspension rod 2 on an outer portion of the suspension rod insertion through-hole 121, and is installed in a mode of sealing a clearance between an inner peripheral part of an opening portion of the suspension rod insertion through-hole 121 and an outer peripheral part of the suspension rod 2.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an electrostatic precipitator. Specifically, the present invention relates to an electric dust collector with improved gas sealing performance between the dust collecting electrode chamber and the insulator chamber.

  In the electrostatic precipitator, the insulator that supports the discharge electrode that applies a high voltage is separated from the dust collection electrode chamber by a gas seal structure (a structure that maintains the airtightness between the two chambers) provided to prevent passage of exhaust gas. It is placed inside the insulator chamber to avoid contact with the exhaust gas to be treated inside the electrostatic precipitator (see Patent Document 1).

  However, it is still difficult to completely shut off the exhaust gas that rises from the dust collection electrode chamber and enters the insulator chamber, and even if a small amount of exhaust gas flows in, if it continues for a certain period of time, the dust on the insulator Insulation failure due to adhesion may occur, and stable charging may not be possible.

Japanese Patent Laid-Open No. 2009-1602

  It is an object of the present invention to provide an electric dust collector with improved gas sealing performance between the dust collecting electrode chamber and the insulator chamber.

  In the case where the inventors of the present invention have insufficient securing of airtightness of the penetrating insulator that supports the suspension rod that is installed by connecting the dust collecting electrode chamber and the insulator chamber, which causes exhaust gas inflow. Therefore, the inventors have found that the above problems can be solved by improving the airtight performance of the insulator itself, which has been overlooked until then, to a sufficiently high level, and completed the present invention. Specifically, the present invention provides the following.

  (1) The dust collecting electrode chamber containing the dust collecting electrode and the dust collecting electrode chamber are disposed above the dust collecting electrode chamber with a space therebetween, or adjacent to each other via a structure capable of blocking an air flow between the two chambers. An insulator chamber that is arranged, a fixed column-shaped through insulator that is fixed to the insulator chamber, and a part of the lower end side thereof is exposed to the outside of the insulator chamber, and one end is An electrostatic precipitator comprising: a penetrating rod that is supported by the penetrating insulator in a manner penetrating the penetrating insulator and has a column-shaped hanging rod that is inserted into the dust collecting electrode chamber at the other end. A first ring-shaped elastic seal member and a second ring-shaped elastic seal member are provided, and the first ring-shaped elastic seal member is wound around the suspension rod and formed on the penetrating insulator. Between the inner peripheral surface of the through hole for inserting the hanging rod and the outer peripheral surface of the hanging rod. The second ring-shaped elastic seal member is installed in a contracted and deformed state, and is wound around the suspension rod outside the hole of the suspension rod insertion through-hole, and the suspension rod insertion through-hole. The electrostatic precipitator is installed in a state in which it is pressed against a gap between an inner peripheral portion of the opening and an outer peripheral portion of the suspension rod facing the inner peripheral portion.

  In the electrostatic precipitator of (1), elastic sealing members are installed in a plurality of different positions in a clearance space around a cylindrical hanging rod, which is supposed to serve as an inflow path of exhaust gas into the insulator chamber. There is. As a result, the gas sealing performance between the dust collecting electrode chamber and the insulator chamber can be improved to an extremely high level. Further, due to the above-mentioned arrangement of the elastic seal members, it is possible to reduce a risk that the elastic seal members are damaged or deteriorated at the same time. Further, since the elastic seal member has a simple installation structure in which it is wound around the suspension rod and installed, the replacement work is easy and the maintainability is excellent. As described above, according to the electric dust collector of (1), the exhaust gas that rises from the dust collecting electrode chamber and enters the insulator chamber can be stably blocked with high accuracy for a long period of time.

  (2) The electrostatic precipitator according to (1), wherein the first ring-shaped elastic seal member is an O-ring.

  In the electrostatic precipitator of (2), as the first ring-shaped elastic seal member, the "O ring" which is also a general-purpose seal material is used. As a result, the gas sealing performance of the electrostatic precipitator described in (1) can be improved to extremely high accuracy. Further, by exchanging this at appropriate intervals, it is possible to stably maintain such a high level of gas sealing performance for a long period of time.

  (3) The electrostatic precipitator according to (1) or (2), wherein the elastic material forming the first ring-shaped elastic seal member is fluororubber.

  In the electrostatic precipitator of (3), the elastic material forming the first ring-shaped elastic seal member is made of various combustible materials containing hydrogen and the like, which have particularly excellent heat resistance and oil resistance among synthetic rubbers. Specified as a fluororubber that has sufficient resistance to natural gas. As a result, the above-described respective effects that the electric dust collector of (1) or (2) can exert are achieved in a wider range of fields in which various high temperature gases, exhaust gas containing oily dust, and combustible gas are treated. Even when applied to industrial equipment, it can be enjoyed stably.

  (4) The second ring-shaped elastic seal member is a seal washer including a washer portion made of a metallic annular member and a sealing lip portion made of an annular elastic member having a larger thickness than the washer portion. The electrostatic precipitator according to any one of (1) to (3).

  In the electrostatic precipitator of (4), as the second ring-shaped elastic seal member, a “seal washer” including a metallic annular base material and an annular elastic member is used. As a result, the gas sealing performance of the electrostatic precipitator according to any one of (1) to (3) can be improved to an extremely high degree of accuracy. Further, by exchanging this at appropriate intervals, it is possible to stably maintain such a high level of gas sealing performance for a long period of time.

  According to the present invention, it is possible to provide an electric dust collector with improved gas sealing performance between the dust collecting electrode chamber and the insulator chamber. Further, this gas sealing performance can be stably maintained for a long period of time.

It is sectional drawing which shows schematic structure of the electrostatic precipitator of this invention. It is a perspective view which shows the schematic structure inside the dust collection electrode chamber of the electric dust collector of FIG. FIG. 3 is a partially enlarged cross-sectional view for explaining a gas seal structure between a dust collection electrode chamber and an insulator chamber in the electric dust collector of FIG. 1. It is a perspective view of the penetration insulator concerning the present invention which constitutes the gas seal structure of FIG. FIG. 4 is a partial enlarged cross-sectional view for explaining further details of the gas seal structure of FIG. 3. FIG. 6 is a partially enlarged sectional view of a portion indicated by a in FIG. 5. It is the top view and sectional view of the 1st ring-shaped elastic seal member which constitutes the gas seal structure concerning the present invention. It is sectional drawing of the 2nd ring-shaped elastic seal member which comprises the gas seal structure concerning this invention.

<Basic structure of electric dust collector>
FIG. 1 is a sectional view showing a schematic configuration of the electrostatic precipitator of the present invention. 1A and 1B are cross-sectional views when the electrostatic precipitator 10 is viewed from different directions substantially orthogonal to each other. As shown in these figures, in the electrostatic precipitator 10, the upper casing 111, the dust collecting electrode 32 that also functions as a side casing, the lower casing 112, and the frame 114 constitute the main part of the external structure.

  Further, the upper casing 111, the dust collecting electrode 32, and the lower casing 112 are combined in this order from above to form a casing of the electric dust collector 10. In the present specification, this housing is referred to as a "dust collecting electrode chamber (dust collecting electrode chamber 200)". In the electrostatic precipitator 10, the dust collecting electrode chamber 200 is arranged apart from the insulator chamber 100 arranged above it, or via a structure capable of blocking the air flow between both chambers. Adjacent to each other. Further, the dust collecting electrode chamber 200 is fixed by the frame 114 so as to be spaced upward from the ground by a predetermined distance. As a material of such a dust collecting electrode chamber 200, conductive FRP (Fiber Reinforced Plastics), stainless steel, carbon steel, or the like can be used.

  FIG. 2 is a perspective view showing a schematic configuration inside the dust collecting electrode chamber 200. As shown in this figure, inside the dust collection electrode chamber 200, the upper grid 31, the dust collection electrode 32, the lower grid 33, the suspension rod 2, the discharge wire 34, the weight 35, the upward spray nozzle 36, and the cleaning pipe. 37 and a downward spray nozzle 38 are provided. The upper grid 31, the dust collecting electrode 32, and the lower grid 33 are arranged so as to be separated from each other by a predetermined distance in this order from above, and are substantially parallel to each other in the horizontal direction.

  As shown in FIG. 3, the hanging rod 2 is supported by the penetrating insulator 1 along the central axis of the columnar penetrating insulator 1 so as to penetrate the same. A negative DC high voltage (charging voltage) supplied from a power supply device (not shown) is directly applied to the suspension rod 2. On the other hand, the high DC voltage of the negative electrode is applied to the discharge line 34 through the upper grid 31. In the present embodiment, the suspension rod 2 is arranged as a rod that is joined to the upper grid 31 and suspends it. However, while penetrating the inside of the dust collection electrode chamber 200, it also functions as an electrode rod. The structure may be such that it is joined to the lower grid 33 and is further suspended.

  In the electrostatic precipitator 10 having the above-described basic structure, the substantially cylindrical through insulator 1 is fixed inside the insulator chamber 100, and a part of its lower end portion is outside the insulator chamber 100 (lower part). Is exposed to. Therefore, if the airtightness of the structure including the penetrating insulator and the suspension rod penetrating the penetrating insulator is insufficient as in the conventional case, the internal space of the penetrating insulator, which is basically a hollow structure, will be There is a fear of becoming a gas flow path from the chamber 200 to the insulator chamber 100. On the other hand, in the electrostatic precipitator 10 of the present invention, by installing the “gas seal structure” having the configuration peculiar to the present invention in the penetrating insulator 1, the gas flow path described above can be provided with high accuracy and for a long time. It stably shuts off over a period of time. The details of this "gas seal structure" will be described below.

<Gas seal structure of electric dust collector>
As shown in FIGS. 5 and 6, the gas seal structure of the electrostatic precipitator 10 includes the columnar main body 11 of the through insulator 1 by the first ring-shaped elastic seal member 13 and the second ring-shaped elastic seal member 16. It is formed near the central portion on the upper surface side. The gas seal structure is configured by winding two kinds of ring-shaped elastic members having different shapes and functions at different vertical positions of the suspension rod 2. Then, each of these ring-shaped elastic members is configured in a different manner so as to fill a gap that can serve as a gas flow path in each of the inside of the through hole 121 for inserting the hanging rod and the vicinity of the opening thereof. .. And, this gas seal structure, which will be described in detail below, is a simple structure that is also excellent in maintainability, and yet has the above-described gas flow with a high level of airtightness and high stability over a long period of time. Can be shut off under.

[First Ring-shaped Elastic Seal Member]
As shown in FIGS. 5 and 6, the first ring-shaped elastic seal member 13, which is one of the above-mentioned two types of ring-shaped elastic members, has an inner peripheral surface inside the through hole 121 for inserting the hanging rod. And the outer peripheral surface of the suspension rod 2 are sandwiched while being pressed from these two surfaces, so that they are installed in a compressed and deformed state. As a result, the first ring-shaped elastic seal member 13 closes the gap between the two surfaces and blocks the gas flow in this portion.

  As the elastic seal member forming the first ring-shaped elastic seal member 13, an “O ring” made of an elastic material such as various synthetic rubbers can be preferably used. As shown in FIG. 7, the “O-ring” is a sealing member that is an endless ring that is made of an elastic material and has a substantially circular cross section and has an annular body shape. As the first ring-shaped elastic seal member for forming the gas seal structure of the electrostatic precipitator 10, an “O ring” having an inner diameter substantially the same as the outer diameter of the suspension rod 2 can be preferably used.

  Further, among various "O-rings", "O-rings" made of fluororubber can be particularly preferably used. By selecting fluororubber, which is excellent in heat resistance and resistance to various combustible gases, as the material of the first ring-shaped elastic seal member 13, in the electrostatic precipitator 10 that treats the combustible gas for a longer period of time. The gas sealing performance can be stably exhibited.

  More specifically, as shown in FIG. 6, the first ring-shaped elastic seal member 13 typified by an “O-ring” has an opening at the center of the top plate 12 that constitutes the top part of the penetrating insulator body. The suspension rod 2 is wound around the suspension rod 2 while being fitted in the seal member storage groove portion 132 formed in the inner peripheral surface of the suspension rod insertion through hole 121 formed as a through hole therein. As shown in FIG. 6, it is preferable that the upper side of the seal member accommodating groove portion 132 be sealed by the restraining plate 14 fixed to the upper surface plate 12 by the bolt 15. In this case, when the deterioration of the first ring-shaped elastic seal member 13 progresses, by removing the pressing plate 14, it is possible to easily replace the pressing plate 14.

  Further, in the space above and below the first ring-shaped elastic seal member 13 fitted in the seal member storage groove portion 132, the stability of the first ring-shaped elastic seal member 13 inside the seal member storage groove portion 132 is stable. In order to increase the temperature, it is preferable that a backup material 131 made of a resin having weather resistance such as polytetrafluoroethylene (PTFE) is embedded so as to fill the space of the seal member housing groove 132.

  Also, as shown in FIG. 6, the first ring-shaped elastic seal member 13 has an elliptical shape with the axial direction of the suspension rod 2 as the major axis when the original cross-sectional shape is circular like an O-ring. It is preferable that the seal member housing groove portion 132 is fitted into the seal member housing groove portion 132 in a deformed state. In this state, the first ring-shaped elastic seal member 13 is uniformly and sufficiently large in pressure over the entire circumference of the contact surface due to the elastic stress, so that the first rod-shaped elastic seal member 13 is inserted into the through hole 121 for inserting the hanging rod. It is pressed against the inner peripheral surface and the outer peripheral surface of the suspension rod 2. Therefore, in this state, the first ring-shaped elastic seal member 13 can maintain the airtightness between the both surfaces with high accuracy.

[Second ring-shaped elastic seal member]
On the other hand, as shown in FIG. 5, the second ring-shaped elastic seal member 16, which is another one of the above-mentioned two types of ring-shaped elastic members, is hung outside the through hole 121 for inserting the hanging rod. The rod insertion through-hole 121 is installed in a state in which it is pressed against a gap between the inner peripheral portion of the opening of the through hole 121 for rod insertion and the outer peripheral portion of the hanging rod 2 facing this portion. As a result, the second ring-shaped elastic seal member 16 seals the gap between the two parts and blocks the flow of gas.

The second ring-shaped elastic seal member 16 includes a washer portion 161 which is a metallic annular base material, and an annular elastic member having a thickness (W ₂ ) larger than the thickness (W ₁ ) of the washer portion 161. It is preferable to use a "sealing washer" in which the sealing lip portion 162 made of is integrated by sharing the opening portion. As shown in FIG. 8, the “sealing washer” means that the sealing lip 162, which contributes to the improvement of the hermeticity by being pressed axially and elastically deformed with respect to the washer 161, protrudes in the axial direction. It is a sealing member characterized by being formed. As the second ring-shaped elastic seal member for forming the gas seal structure of the electrostatic precipitator 10, a “sealing washer” having an inner diameter substantially equal to the outer diameter of the suspension rod 2 can be preferably used.

  More specifically, as shown in FIG. 5, the second ring-shaped elastic seal member 16 has an opening at the center of the upper surface plate 12 having a constant thickness that constitutes the upper surface portion of the through-insulator body, and has the above-mentioned thickness. The suspension rod 2 is wound so that the suspension rod insertion through-hole 121 formed as a through hole along the direction covers the periphery of the opening and is placed. The second ring-shaped elastic seal member 16 is further pressed against the upper surface plate 12 with a sufficiently strong pressure by the tightening mechanism including the washer 17A, the spring 18, the washer 17B, and the nut 19. In particular, when the second ring-shaped elastic seal member 16 is a sealing washer having the above structure, the sealing lip portion 162 elastically deformed by the above-mentioned tightening is applied to the entire portion pressed by the elastic stress. On the other hand, it is pressed with equal and sufficient pressure. Therefore, in this state, the second ring-shaped elastic seal member 16 can maintain the airtightness between the both parts with high accuracy.

  As shown in FIG. 4, the through-insulator 1 has a gas seal structure for shutting off the gas flow at the periphery of the through-hole in which the suspension rod 2 is inserted, even on the lower surface side of the columnar main body 11. More preferably, it is formed. As the gas seal structure on the lower surface side, for example, a donut-shaped washer that covers the peripheral portion is fixed to the bottom surface of the through insulator 1 by means of bolting or the like via a resin packing. A preferable example is a gas seal structure having a gas seal.

  Then, in the through insulator 1, as shown in FIG. 3, a flange portion 113 protruding outward from the outer edge of the main body 11 in a flange shape is fixed around a fixing hole in the bottom surface of the insulator chamber 100 through which the through insulator main body is penetrated. As a result, a part of the main body 11 on the lower end side of the flange portion 113 is fixedly installed in the insulator chamber 100 in a manner to be inserted into the dust collecting electrode chamber 200. In addition, it is preferable to perform gas sealing treatment such as caulking treatment around the hole into which the main body 11 of the through insulator 1 is inserted.

[Effect of gas seal structure in electrostatic precipitator]
As described above, the electrostatic precipitator 10 has the unique gas seal structure including the two ring-shaped elastic seal members, so that the penetrating insulator 1 and the hanging rod 2 penetrating the penetrating insulator 1 are provided. The airtightness at the abutting portion is remarkably improved. As a result, it is possible to interrupt the flow of gas, which has been overlooked in the conventional electrostatic precipitator, through the internal space of the insulator with high and stable airtightness.

  Further, in this gas seal structure, the elastic seal members are installed in different modes at a plurality of different locations that are supposed to be gas flow paths, so that the time of damage or deterioration of each elastic seal member overlaps. The risk is extremely low, and the electrostatic precipitator can be safely operated for a long period of time by systematically performing replacement work of each elastic seal member at an appropriate time.

  The present invention is gas sealing means widely applicable to an electric dust collector having a structure in which a dust collecting electrode is supported by an insulator and is suspended. In these electrostatic precipitators, various conventional gas sealing means formed in a portion other than the insulator and the gas sealing means of the present invention are appropriately combined in an appropriate manner to carry out the conventional gas sealing. By complementing the drawbacks of the means, the gas sealing performance for preventing the inflow of exhaust gas into the insulator chamber 100 in these electrostatic precipitators can be significantly improved.

1 Penetration insulator 11 Main body (penetration insulator main body)
111 Upper Casing 112 Lower Casing 113 Flange Part 114 Frame 12 Top Plate 121 Through Hole for Hanging Rod 13 First Ring-shaped Elastic Seal Member 131 Backup Material 132 Sealing Material Storage Groove 14 Suppression Plate 15 Bolt 16 Second Ring Elastic Seal member 161 Washer part 162 Sealing lip part 17 (17A, 17B) Washer 18 Spring 19 Nut 2 Hanging rod 31 Upper grid 32 Dust collecting electrode 33 Lower grid 34 Discharge line 35 Weight 36 Upward spray nozzle 37 Cleaning pipe 38 Downward spray Nozzle 10 Electric dust collector 100 Insulator chamber 200 Dust collector chamber

Claims (4)

A dust collecting electrode chamber containing a dust collecting electrode,
An insulator chamber, which is arranged above the dust collecting electrode chamber so as to be spaced apart from each other, or adjacently arranged via a structure capable of blocking an air flow between both chambers,
A fixed columnar through-insulator fixed to the insulator chamber, a part of the lower end side of which is exposed to the outside of the insulator chamber,
One end is supported by the penetrating insulator in such a manner as to penetrate the penetrating insulator, and the other end is a columnar hanging rod inserted into the dust collecting electrode chamber,
An electric dust collector comprising:
A first ring-shaped elastic seal member and a second ring-shaped elastic seal member,
The first ring-shaped elastic seal member is wound around the suspension rod, and has an inner peripheral surface inside the suspension rod insertion through hole formed in the through insulator and an outer peripheral surface of the suspension rod. And the second ring-shaped elastic seal member is wound around the hanging rod outside the through hole for inserting the hanging rod, and the hanging rod is inserted. An electrostatic precipitator installed in a state of being pressed into a gap between an inner peripheral portion of an opening portion of the through hole for use and an outer peripheral portion of the suspension rod facing the inner peripheral portion.   The electrostatic precipitator according to claim 1, wherein the first ring-shaped elastic seal member is an annular O-ring having an inner diameter substantially the same as the outer diameter of the suspension rod.   The electrostatic precipitator according to claim 1 or 2, wherein the elastic material forming the first ring-shaped elastic seal member is fluororubber.   The second ring-shaped elastic seal member is a seal washer composed of a washer portion made of a metallic annular member and a sealing lip portion made of an annular elastic member having a larger thickness than the washer portion. The electrostatic precipitator according to any one of 1 to 3.

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